Corcovado Pharmaceuticals. Corcovado Pharmaceutical's cost of debt is 6.80%. The risk-free rate of interest is 3.90%. The expected return on the market portfolio is 8.50%. Corcovado's effective tax rate is 35%. Its optimal capital structure is 70% debt and 30% equity. a. If Corcovado's beta is estimated at 1.80, what is its weighted average cost of capital? b. If Corcovado's beta is estimated at 1.30, significantly lower because of the continuing profit prospects in the global pharma sector, what is its weighted average cost of capital? a. If Corcovado's beta is estimated at 1.80, what is its weighted average cost of capital? % (Round to two decimal places.) b. If Corcovado's beta is estimated at 1.30, significantly lower because of the continuing profit prospects in the global pharma sector, what is its weighted average cost of capital? % (Round to two decimal places.)